Gday Mark
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an encoder mounted directly to the axis would give an absolute position (we are here)
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Understood, but some of the high precision encoders arent "absolute" encoders, they just have high precision.
The high precision "absolute" encoders are horrendously expensive, relative to a retrofit unit that is just used to get better tracking.
Again, all i am musing is, could a big gain in accuracy ( relative to present ) be gained by using a suitable encoder on the worm.
This wont remove PE, but it means it can be mapped on a true 1:1 basis, hence removing all the quirks of a gearbox with odd gears.
Andrew